http://www.hunt-corp.com/office/painters/officeframe.html

Hunt Painter Paint Markers

I've had good luck with this type marker except that it has a large diameter
and is difficult to attach to the plotter pen holder. Ink is very strong -
hard to remove with lacquer thinner after setting a day or so!

Thanks for the info on the red markers. I'm using a hp7475a and Eagle to
layout the boards. Does anyone know how to have Eagle or the MS Windows
plotter driver not pick pen 1 (SP1). Right now I'm sending the plots to a file
and hand editting the pen select out so that the plotter uses the pen I load
manually.

thanks
chuckc


On Wed, 13 Nov 2002 14:54:52 -0600 Dale Botkin <dale@BOTKIN.ORG> wrote:

> On Wed, 13 Nov 2002, David Minkler wrote:
>
> > HP 7475A plotters are 'nearly' free (plus
> shipping) on ebay.  Search on
> > 7475a.
>
> Ah.  Stupid me, I hadn't even looked.  Last
> time I did look for one was
> several years ago, and they were hard to find
> then -- but eBay was barely
> a startup at that time.  You can do this with
> any of that series of HP
> plotters, I think I also used a 7470 at the
> time.
>
> I can't tell you guys how nice this setup
> works, though.  The pens I found
> are only a couple of bucks each, and I could go
> from layout to complete,
> etched & drilled board in about an hour for a
> simple project.  Lines were
> very clean, you just have to remember you
> simply can't do 8 mil lines with
> 4 mil spacing or anything crazy.  I did have
> traces between DIP pads with
> no problems.
>
> I didn't realize they were so common and cheap.
>  Wow.  This beats the hell
> out of trying to modify an ink jet, trust me.
> The standard pen body can
> be used as a holder, just cut off the top,
> remove the guts, cut off the
> tip just at the end of the large taper and
> slide in an ultra-fine marker.
> All you have to be careful of is that you load
> the pen manually and bypass
> the cover interlock switch so you can plot with
> the flip-up smoked cover
> open to clear the tall pen.  Set the plot speed
> to 1IPS, plot a reverse
> image and Presto!  Nearly instant PCB.  Only
> difficulty might be large
> copper areas like ground planes, I seem to
> recall that doesn't work too
> well and will require some manual touching up
> prior to etching.
>
> Dale
>
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